Revert "Add gsutil 4.13 to telemetry/third_party"

tools/telemetry/third_party/gsutil/third_party/rsa/doc/intro.rst

Index: tools/telemetry/third_party/gsutil/third_party/rsa/doc/intro.rst
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-Introduction & history
-==================================================
-
-Python-RSA's history starts in 2006. As a student assignment for the
-University of Amsterdam we wrote a RSA implementation. We chose Python
-for various reasons; one of the most important reasons was the
-`unlimited precision integer`_ support.
-
-.. _`unlimited precision integer`:
-    http://docs.python.org/library/stdtypes.html#numeric-types-int-float-long-complex
-
-It started out as just a module for calculating large primes, and RSA
-encryption, decryption, signing and verification using those large
-numbers. It also included generating public and private keys. There
-was no functionality for working with byte sequences (such as files)
-yet.
-
-Version 1.0 did include support for byte sequences, but quite clunky,
-mostly because it didn't support 0-bytes and thus was unsuitable for
-binary messages.
-
-Version 2.0 introduced a lot of improvements by Barry Mead, but still
-wasn't compatible with other RSA implementations and used no random
-padding.
-
-Version 3.0 introduced PKCS#1 v1.5 functionality, which resulted in
-compatibility with OpenSSL and many others implementing the same
-standard. Random padding was introduced that considerably increased
-security, which also resulted in the ability to encrypt and decrypt
-binary messages.
-
-Key generation was also improved in version 3.0, ensuring that you
-really get the number of bits you asked for. At the same time key
-generation speed was greatly improved. The ability to save and load
-public and private keys in PEM and DER format as also added.
-
-
-